Hi Lars,
Finally, I've been looking all over for this thread and would love to see more pics of the brackets in the first post.
My frame tabs are broke off as well and as I have a couple home made brackets in play already, the machined ones here look to be the best. Does anyone have drawings or a cad model?
Also, I've seen here several comments regarding wall thickness for the tapped holes required to bolt on these type brackets and what my experience is using four 5mm bolts on each side is that the bolts/tapped holes hold fine; it's the bracket that tears and breaks the next time you over stress the seat, or flip the bike
Please let me know about drawings.
Thanks!